After fabricating the door and cutting holes for the hartwell latches, I test fit the floor in the plane.
Here is a closeup of one of the hartwell latches. They make a crazy number of models of these, but four of the eight I bought off eBay were the same, so I used those.
To open the door, you push in on the button marked “PUSH” (duh)…
and the other part of the latch springs open.
Once both latches are released, the door can be opened. The reinforcing ring provides a lip that the door can be closed against (and the latches catch under).
